Pelltech PK250 Operation & User’s Manual

Vers: A2 page 1 / 26 Pellet boiler PK250-PK1000 User manual

Vers: A2 page 2 / 26 Contents 1 General .................................................................................................................................................. 4 1.1 References to other documents .................................................................................................... 4 1.2 Unit description ............................................................................................................................. 4 2 Safety ..................................................................................................................................................... 5 2.1 Safety Instructions for installation, use and service ..................................................................... 5 2.2 Safety instructions regarding maintenance and cleaning ............................................................. 6 2.3 Warnings ....................................................................................................................................... 7 2.4 Safety devices ................................................................................................................................ 7 2.5 Permitted usage ............................................................................................................................ 7 3 Technical specifications and dimensions .............................................................................................. 8 3.1 Description .................................................................................................................................... 8 3.2 Technical data ............................................................................................................................... 9 3.3 Dimensions .................................................................................................................................. 10 3.4 Recommended distances for the boiler room ............................................................................ 11 4 Monitoring and control equipment .................................................................................................... 12 4.1 Boiler control unit........................................................................................................................ 12 4.2 Internet module .......................................................................................................................... 13 5 Handling and transport ....................................................................................................................... 14 6 Installation ........................................................................................................................................... 15 6.1 Installation room requirements .................................................................................................. 15 6.2 Required installation on site ....................................................................................................... 16 6.3 Connecting the boiler to the chimney ......................................................................................... 18 6.4 Connecting safety devices ........................................................................................................... 19 6.5 Connecting PV-series burner ....................................................................................................... 19 6.6 Hydraulic connecton scheme ...................................................................................................... 19 7 Electrical connections .......................................................................................................................... 20 8 Liquid in the heating system ............................................................................................................... 20 9 Initial start-up ...................................................................................................................................... 21 9.1 Filling the fuel tank ...................................................................................................................... 21 10 Cleaning and maintenance .............................................................................................................. 22

Vers: A2 page 3 / 26 10.1 Instructions for inspection and maintenance ............................................................................. 22 10.2 Maintenance ............................................................................................................................... 23 10.3 Cleaning the boiler ...................................................................................................................... 24 10.4 Cleaning the burner ..................................................................................................................... 24 11 Warranty and manufacturer's liability ............................................................................................ 25 12 Declaraton of conformity ................................................................................................................ 26

Vers: A2 page 4 / 26 1 General The instruction manual is an integral and essential part of the product and must be kept by the user or system manager. The owner / user shall read and understand this manual before installation and operation of the boiler. This manual is intended for all users and contains general information, installation instructions and handling with following boilers: PK250, PK350, PK500, PK700 and PK1000, which are heat generators in boiler category 5 for heating systems with hot water with a safety temperature of 110 °C. PK-series industrial boilers may only be set up and comissioned by specialists. This rules out any incorrect assembly. We recommend you pay great attention to the safety regulations. The manufacturer of the equipment, Pelltech OÜ, demands that the operator of the device is competent and has sufficient knowledge in the field. The manufacturer does not take responsibility any damage done to the equipment, personal injury, harm to animals or property damage if an incompetent person or persons performs work for which he is not qualified or if the person operating of the device fails to observe the instructions contained in the manual. Note: Operator is the person or persons responsible for the installation, operation, adjustment, maintenance, cleaning, repair or removal of the machinery. 1.1 References to other documents Following document is original user and installation manual for PK250, PK350, PK500, PK700 and PK1000 pellet boilers. In this document are references made to:  Maintenance and cleaning manual for the boiler and burner  Software and problem handling manual for the burner  Software and problem handling manual for BBB series burners (PV350a-PV1000a)  Software and problem handling manual for SBB series burners (PV250a) 1.2 Unit description Present device is a solid fuel boiler that produces low pressure warm water. PK – series boilers are highly efficient 3-pass boilers which are meant to go together with PV – series pellet burners. All boilers are equipped with automatic cleaning of the heating surfaces and fully automatic ash removal system which extend the maintenance intervals and keep the efficiency high. Main data is given in section Technical specifications and dimensions.

Vers: A2 page 5 / 26 2 Safety Read and follow these directions carefully. Read the safety instructions carefully before installation. Always follow the safety instructions during installation and during maintenance. Installation, operation, service and other work must be carried out by qualified personnel in accordance with local codes and regulations. Proper installation of the boiler is necessary for safe and efficient operation. Installing this product improperly may result to damage of the goods. Contact your local building inspector to obtain any necessary permits or inspection guidelines before installing the product. Contact local building or fire officials about restrictions and installation inspection requirements in your area. Contact your local authority (such as municipal building department, fire department, fire prevention bureau, etc.) to determine the need for a permit. A working smoke detector is required and must be installed in the same room as the boiler. 2.1 Safety instructions for installation, use and service The owner / user shall read and understand this manual before installation and operation of the burner. For proper function and to avoid accidents and damage, these instructions must be followed. Wrong handling and incorrect settings can result in injury, damage and / or malfunction of the equipment. Following instructions apply to PK-series boilers PK250...PK1000:  The boiler room where the boiler is installed must fulfil all rules and recommendations given by the local authorities.  To guarantee the efficiency of the appliance and ensure that it functions correctly, it is vital that qualified personnel performs annual maintenance.  Specified safety requirements must be followed in accordance with nationally applicable regulations, standards and guidelines.  Before performing any cleaning or maintenance make sure that the boiler is switched off from the main power supply for atleast two hours.  Keep children away from the equipment .  Do not touch the equipment during operation.  Make sure that no flammable materials are stored in the boiler room or nearby the boiler.  It is recommended to wear a respirator while handling pellets.  The room where the boiler is installed must fulfill all rules and recommendations in accordance with local rules and regulations.  All electrical installation, plumbing, chimney sweeping and service work must be done by certified and qualified personnel in accordance with local rules and regulations.

Vers: A2 page 6 / 26  Do not obstruct the terminals of intake/ outlet ducts.  Ensure that flue systems are clear. Ensure an adequate supply of combustion air. 2.2 Safety instructions regarding maintenance and cleaning Touching live components can result in life threatening injuries. After switching the control unit off, there are still live components inside the control unit until enclosure:  Switch OFF the power supply, e.g. a mains, and check the system is disconnected. Hot surfaces and fluids can lead to burns:  Before maintenance and cleaning work, switch OFF the system and let it cool down.  Never touch hot surfaces on the boiler, burner, flue system or pipework.  Wear suitable personal protective equipment. Hot surfaces and fire from aperatures can result in severe burns:  Doors, covers and aperatures fastened shut with screws must not be opened during heating operation.  Allow hot components to cool down before removing. When operating the ash container, there is a risk of fire and burns:  Wear suitable personal protective equipments.  Only dispose the hot ash in fireproof containers with covers. Disposal of hot ash in an unsuitable vacuum cleaner creates a risk of fire from ignition of filters and plastics:  Use an ash vacuum cleaner that is specially designed for this purpose.  Never use domestic vacuum cleaners made of plastic with fabric/paper filters. Wood dust, pellet dust, cinders and soot pose a risk to the eyes, skin and airways:  Wear suitable personal protective equipment, especially breathing equipment and safety goggles. Note: Before restarting the heating system, all opened covers and flaps on the boiler must be closed again. Note: Observe the country-specific regulations on the disposal of materials, waste and system components. Note: Carry out the cleaning at the specified intervals.

Vers: A2 page 7 / 26 2.3 Warnings  For personal and operational safety, use only spare parts provided or approved by Pelltech OÜ in order to avoid any damage to the boiler and dangers resulting from it. Use of spare parts not provided or approved by Pelltech OÜ will void the warranty.  Do not open any boiler door while the burner is in operation.  Before carrying out any cleaning or maintenance operations, disconnect the appliance from the mains power supply using the system switch and/ or the relevant external components and let it cool down.  The appliance must not be used by anyone with little excperience and knowledge, unless they are supervised or have been instructed to use the appliance by the person in charge of its safety. 2.4 Notice  Manufacturer of boilers has the right to make changes in construction of boiler. 2.5 Safety devices The manufacturer obligates the end user to use following safety devices with appliances that are described in this manual:  Working thermostat  Safety thermostat  Boil-dry protection  Overpressure valve Depending on the local laws and regulations there might be the need for following safety devices:  Overpressure pressure switch  Underpressure pressure switch 2.6 Permitted usage The appliance is only intended to be installed and operated in sealed unvented heating systems, with due attention paid to the associated installation, service and operating instructions. It is only designed for the heating of heating water that is of potable water quality. Any usage beyond this must be approved by the manufacturer in each individual case. Incorrect usage or operation is prohibited and will result in an exclusion of liability. Incorrect usage also occurs if the components in the heating system are modified from their intended use (e.g. if the flue gas and ventilation air paths are sealed) or if other fuels than those intended for this appliance are used.

Vers: A2 page 8 / 26 3 Technical specifications and dimensions 3.1 Description The PK250…PK1000 pellet boilers are high-efficiency three-pass water boilers for wood pellet burners and are designed to supply heat energy to multi-storey buildings or industrial buildings. The boilers are also suitable for heating networks of smaller settlements. All boilers are non-condensing boilers. To ensure good burning quality and stable underpressure in the furnace, a smoke extractor must be installed. To reduce air pollution, an ash cyclone can be installed. The boiler door is designed symmetrically, which enables opening the door both to right and left. Automatic cleaning of the heating surfaces and fully automatic ash removal improve efficiency and extend the maintenance intervals. The burner controller controls the frequency of the cleaning cycles according to predefined parameters. Ash is cleaned from third and second pass pneumatically and from the furnace with ash scrape and auger. Although the boiler has its cleaning systems, it has to be cleaned from time to time manually to keep the burning quality and efficiency of the boiler as high as possible. The boiler is equipped with following cleaning systems:  Pneumatic cleaning – Third pass heat exchanger tubes and second pass tube are cleaned pneumatically. Residues are blown back of the boiler into an smoke collector box where the ash is moved with ash augers to ash container.  Ash scrape – Combustion residues that falls on the bottom of the furnace are scraped to ash auger and moved to ash container.  Ash auger – Accumulated ash inside the boiler and cyclone is moved with ash auger to ash container behind the boiler or outside the boiler house.  Ash cyclone – Ash cyclone (if in use) catches fine particles to ensure cleanest flue gases.  Ash container – Ash is collected in a suitable container which shall be regularly emptied. Industrial PK boilers are specially designed for work with pellet burners accordingly:  PK250 with PV250  PK350 with PV350  PK500 with PV500  PK700 with PV700 or PV500  PK1000 with PV1000 or PV700 (additional flange required)

Vers: A2 page 9 / 26 3.2 Technical data Boiler model Unit PK250 PK350 PK500 PK700 PK1000 Rated heating output kW 235 329 490 650 893 Rated heat input kW 250 350 530 700 950 Heat output range kW 66-235 94-329 150-490 188-650 235-893 Permiss. operating temperature °C 95 (110*) Permiss. operating pressure bar 4 6 Minimum return temperature °C 55 Test pressure bar 5.75 9 Required draught mbar -0.04 … -0.12 Total height mm 1349 1349 1618 1785 Total width mm 1170 1170 1300 1570 Total length mm 2303 2794 3288 3712 Combustion chamber length mm 1441 1933 1954 2784 Combustion chamber diameter mm 475 621 734 Net weight kg 983 1204 2037 3168 Boilers water volume l 523 696 947 1850 Boiler flow and return connections DN65/PN6 DN80/PN6 DN100/PN6 DN125/PN6 Distance between connections mm 880 1372 1384 2094 Drain connection (inner thread) ¾" 1" Safety valve connection pc 1x 1¼ 1x R2" 1x R2" Mains supply V 230VAC 3 x 380VAC Electrical consumption at 𝑄𝑁 ** W 480 Electrical consumption at 𝑄𝑚𝑖𝑛** W Electrical consumption at stand by ** 20 Heat exchange surface m² 11.93 15.83 23.5 42.6 Flue gas outlet mm 220x200 300x240 420x240 Flue gas temp. at 𝑄𝑁*** °C 150…170 Flue gas temp. at 𝑄𝑚𝑖𝑛*** °C 114 Flue gas amount at rated output m³/h 1250 <2500 Efficiency % 94 Boiler class 5 * Safety thermostat must be regulated accordingly ** Given are electrical consumption with burner corresponding to the boiler (e.g. PK250 with PV250, PK500 with PV500 etc.) *** Given are flue gas temperatures at boiler water temperature 75°C / 55°C

Vers: A2 page 10 / 26 3.3 Dimensions Boiler model PK250 PK350 PK500 PK700 PK1000 a 196 195.7 216 218 b 271 291 331 c 1490 1982 2000 2828 d 286 285.5 336 335 e 550 550 702 600 f 70 70 70 62 g 2314 2808 2942 3550 h* 1000/2000 1000/2000/3000 i 1470 1517 j 235 235 k 1278 1278 1518 1688 l 1348 1349 1615 1785 m 1170 1170 1400 1570 n 1070 1070 1280 1450 o 3544 4539 p 305 305 308 358 r 880 1372 1384 2084 s 745 991 1000 1400 t 220 300 420 u 200 240 240 v 240 325 450 w 220 265 270 *Different possibilities for ash removal systems also available

Vers: A2 page 11 / 26 3.4 Recommended distances for the boiler room Given are the recommended clearances. To enable convenient installation and maintenance, observe the stated clearance dimensions; maintain the minimum clearances where the space is tight (dimensions in brackets). PK250 PK350 PK500 PK700 PK1000 A1 1600 1800 1900 A2 1211 1390 1570 B 1776 2268 2336 2986 3180 C1 1300 1300 C2 570 660 660 D 500 (20) E 1070 1280 1450 F 550 900 850 G1 610 810 1050 1165 G2 660 860 1100 1215 Figure 1 Single boilerhouse (left side) and dual boilerhouse (right side)

Vers: A2 page 12 / 26 4 Monitoring and control equipment The operation of the boiler is monitored and controlled by a burner controller and boiler control unit which consists boiler controller. Boiler controller is meant to be used as a device for controlling boilers work, but also as a smart home controller. All of the boilers safety devices are connected to the burners electrical circuit. According to local laws and regulations, pressure and temperature gauges might be needed. The boiler and burner operate in fully automatic mode and do not require constant monitoring. The daily work of the burner is controlled by the boiler thermostat and the burner controller. The thermostat switches the burner on and off according to the set temperature. Burner’s controller:  controls the fuel supply and the quality of the combustion process  selects the optimal power levels  controls pneumatic cleaning of the heat exchanger tubes of third and second pass  controls the work of the ash scrape and ash auger  regulates the speed of the flue gas fan according to the pressure sensor or a predetermined power level  ensures the safety of the entire system In case of burner error/malfunction please look at document: Software and problem handling manual DK0391 for PV250 and document DK0209 for PV350…PV1000. Note: In the event of an emergency or power failure during the work process, the burner will shut down the boiler and finish its cycle safely. 4.1 Boiler control unit All of industrial PK-series boilers can be equipped with boiler control unit EB0005 which includes the following:  Touch controller – can regulate up to 2 valves, up to 4 pumps for boiler circulation, up to 7 wired temperature sensors, wireless sensors for room and outdoor temperature  Internet module for boiler – enables remote control and data observing and logging via internet  2 working thermostats (mechanical and electronical)  Safety thermostat – automatic cut-off switch  Oxygen sensor – for measuring O2 concentration in the flue gas  2 temperature sensors (1m and 2m) – for measuring flow and return water temperatures  Fluegas temperature sensor – for measuring fluegas temperature

Vers: A2 page 13 / 26 Note: For further information about the use of boiler control unit please look at the document DK8001 – EP0012 Instruction manual. 4.2 Internet module Internet module EP0017 enables simple follow up, control and software upgrade of Pelltech burners and boilers over the internet. Module is connected with burner or boiler control unit and local internet router. Internet module is already installed with boiler control unit or inside the burner. Connecting your burner/ boiler online, gives you opportunity to follow device anytime needed in your laptop or in your phone. You will get a message in case some error should occur, for example when silo runs out of pellets or there is an unexpected electrical cut off.

Vers: A2 page 14 / 26 5 Handling and transport Transport the boiler to the installation location in an upright position. It is permitted to lift the boiler using pallet truck or by the lifting eyes . Any other transport method is prohibited.

Vers: A2 page 15 / 26 6 Installation Installation must be performed by qualified staff, which assumes complete responsibility for the definitive installation and consequent good functioning of the product installed. One must also bear in mind all laws and national, regional, provincial and town council standards present in the country in which the appliance has been installed, as well as the instructions contained in this manual. The flue gas exhaust and hydraulic connections must be carried out by qualified personnel who must issue installation conformity documentation compliant with national standards. The installation of the boiler is based on the required project documentation and, as a general rule, also a building permit. 6.1 Installation room requirements The boiler room must meet all the requirements, instructions, standards and regulations established by local legislation, which means that the entire installation process requires the existence of project documentation to the extent required by law. Installation location requirements:  Dry, frost-proof and free of dust  High humidity levels to be avoided  Room must be at sufficient height, area and required fire resistance  Max. ambient temperature 30 °C  Reliable supply of fresh air  Room must provide possibility of installing (modular) chimney  The boiler must be positioned on a non-combustible substrate The size and location of the pellet tank depends on the capacity of the boiler and the available free space in the building or outdoors. In outdoor conditions, it is expedient to use prefabricated metal tanks with a volume that guarantees the required amount of fuel for at least 7-10 days when the boiler / burner is operating at maximum power. If there is a sufficient interior space, it is expedient to build a pellet tank in the room adjacent to the boiler house. In both cases, there is a wide range of technical solutions that can be determined with the help of a specialist.

Vers: A2 page 16 / 26 6.2 Required installation on site Step 1: Mounting ash auger under the boiler body

Vers: A2 page 17 / 26 Step 2: Mounting an ash auger extension Step 3: Mounting linear motors

Vers: A2 page 18 / 26 Step 4: Mounting boiler side panels 6.3 Connecting the boiler to the chimney Although PK boilers are highly efficient, flue gas temperatures below 90 °C can occur during partial load operation of the boiler. Therefore moisture resistant flue gas duct and chimney should be connected to the boiler. A boiler flue connection with condensate trap in the flue pipe should also be installed.

Vers: A2 page 19 / 26 6.4 Connecting safety devices The pressure relief valves in the boiler must not exceed the permissible operating pressure of the boiler (see Technical data). To install the pressure switch, the boiler has a 3/4"pipe nipple on top of the boiler. The dry-boiling protection is installed according to the design of the hydraulic part. The electrical switches of all safety devices are connected to the pellet burner connector X13. 6.5 Connecting PV-series burner Installation of the PV-series burner on the boiler door is described in document: Installation manual of PV250…PV1500 pellet burner. 6.6 Hydraulic connecton scheme Depicted are two samples of possible solutions for connecting the boiler. Inside the green square is the consumer side of the system.

Vers: A2 page 20 / 26 7 Electrical connections None of the boilers have external electrical connections. All electrical equipment installed on the boiler is connected directly to the burner. When using a boiler controller, all of the safety devices are connected to the boiler controller. In the absence of the controller, the electrical connections of the safety devices must be connected in series to the burner safety circuit. The boiler comes with the following electrical equipment:  Linear motor for moving the ash scrape  Linear motor for the flue gas collector chamber damper  Pneumatic valve controller  Ash auger PK250 is designed to operate from 230V/50Hz supply. The other boilers are designed to operate from 3x380V 50Hz supply. A description of the electrical connection diagram for the boiler and burner is given in section “Electrical connections” of the corresponding pellet burners installation manual. All of the electrical connections to the equipment may only be made by qualified personnel. All applicable norms, rules, instructions and standards must be observed when performing electrical work. In overvoltage hazardous areas, it is advisable to protect the equipment with appropriate overvoltage limiters. 8 Liquid in the heating system Unsuitable fill water increases the level of deposits and corrosion, and may lead to system damage.  Flush the heating system thoroughly before filling.  Only fill with water of potable quality.  Special antifreeze suitable for heating systems can be added to the fill water. In the heating system is allowed:  softened water  up to 50% glycol solution

Vers: A2 page 21 / 26 9 Initial start-up The following preconditions must be met before the initial start-up:  The boiler is installed correctly and connected to the water supply and the heating system.  Thermostats sensitive elements must be placed in their pockets.  All safety devices are connected to burners safety circuit.  The heating system is washed, filled and ventilated.  Heat energy consumption is guaranteed.  The boiler is connected to the chimney.  The boiler is connected to the mains, the boiler and external auger plugs are firmly in their sockets.  There is a sufficient amount of pellets in the pellet tank.  The external auger is installed correctly and connected to the burner.  The boiler door are closed and air needed for combustion is provided by the burner.  The boiler thermostat is set to the lowest temperature.  The burner is installed correctly.  The burner housing and the combustion chamber are securely connected. Note: The initial start-up must not be performed if one of the conditions is not met. Prior to the initial start-up of the burner make sure that:  The boiler thermostat is installed and is functioning properly.  The feeding auger of the burner is installed and connected to the burner.  The smoke duct is connected to the chimney, the dampers for smoke gases are open and there is sufficient draught. When the burner is operating, the negative pressure inside the furnace must stay between 5-20 Pa.  Extinguisher system is in working condition and pressure switch is connected to safety circuit (see extinguisher manual DK0004). 9.1 Filling the fuel tank Prior to initial start-up, a quantity of pellets must be available in the fuel tank to ensure that the boiler operates at least up to the set temperature at the boiler outlet. Fuel can be added to the tank at any time. When the fuel runs out, the burner stops safely.

Vers: A2 page 22 / 26 10 Cleaning and maintenance Regular cleaning of the boiler is a guarantee of maximum efficiency and longevity. The main task of the boiler is to transfer the heat energy generated by the combustion of fuel through the water jacket of the boiler walls. The cleaner are the heat exchange surfaces, the higher is the efficiency of the boiler. The cleaning system is also necessary to achieve the required draft level, which in turn ensures optimal burner operation. Depending on the heating intensity and the quality of the pellets, the frequency of the boiler cleaning cycles may vary, but the manufacturer recommends cleaning the first and second boiler walls of accumulated ash and combustion residues at least twice a year and always after the heating period. Before cleaning the boiler and burner, the burner must be switched off from the burner main menu. Allow the burner to complete the combustion process and allow the boiler to cool for at least two hours before starting cleaning work. Switch off the boiler at the main switch. Only now can you safely open the boiler door and start cleaning. It is advisable to empty the ash container when it is 2/3 full (caution - the ash container may also contain some glowing pellets). Periodic cleaning of the boiler always involves emptying the ash container. Regular maintenance and cleaning ensures troublefree, energy efficient and environmentally responsible heating operation. Your heating system must be serviced and cleaned by an authorised contractor at least once in a year. In this regard, the manufacturer recommends arranging an inspection and maintenance contract with an authorized Pelltech representative. 10.1 Instructions for inspection and maintenance Before carrying out maintenance operations, always perform the following operations:  Switch off the burner from the main menu.  Allow the burner to complete the combustion.  After the boiler has been switched off, wait for it to cool down for 2 hours. You need to wait for the temperature of the water circulating in the boiler drops and for the surfaces of the heat exchanger to have cooled down to safe levels.  Disconnect the main switch.  At this stage, the maintenance procedure can begin.

Vers: A2 page 23 / 26 10.2 Maintenance Maintenance and cleaning work on the boiler Interval Activities System user Heating contractors Every 2 months or *determined amount of fuel burned* Check the fill level of ash container and empty if necessary X Check that ash auger and ash scrape are working properly – in the furnace should not be redundant ash accumulation X Check that pneumatic cleaning system is functioning properly – second and third passage should be clean X Annual service or determined amount fuel burned Clean the furnace heat exchanger X Service the safety valves and check their operation X Check flue system and make sure it is working correctly X Clean lambda probe (if in use) X Check the flue gas collector chamber behind the boiler – clean if necessary X Clean flue gas fan X Clean ash cyclone (if in use) X Maintenance and cleaning work on the burner Interval Activities System user Heating contractors Every 2 months or determined amount of fuel burned Take out the combustion grates, clean them from slag, clean the holes of the grates X Check that internal auger spiral has not burned too short X Clean the flame sensor X Clean combustion chamber and under the grates X Check visually refractory tiles X Check visually cast iron grates – make sure the grates are moving in and out unhindered X Annual service or determined amount fuel burned Check that extinguishers gauge is on green X Emissions testing X Every 5 years Replace the battery inside the burner X

Vers: A2 page 24 / 26 Maintenance and cleaning work on the fuel store Interval Activities System user Heating contractors Yearly Clean the boiler room X *Specified fuel amounts for the services* Model Burned fuel til annual service Burned fuel til every two month service 250 100t 20t 350 125t 25t 500 200t 40t 700 300t 60t 1000 400t 80t 1500 500t 100t Note: The cleaning intervals are intended as a guide that can differ, regard to the fuel quality and operating conditions. 10.3 Cleaning the boiler For PK – series boiler cleaning please look at Cleaning and maintenance manual for PK – series boilers. 10.4 Cleaning the burner For PV – series burner cleaning please look at Cleaning and maintenance manual for PV – series burners.

Vers: A2 page 25 / 26 11 Warranty and manufacturer's liability The warranty protects the user of the appliance against the manufacturer's defects for 2 years if the boiler has been used in accordance with these instructions. The warranty starts from the date on the sales invoice, unless different agreements. The warranty does not apply if defects have occurred:  by wrong mounting, incorrect operation of the product or defects caused by incorrect maintenance  during transport and / or handling by the user  improper installation by the installer  misuse of the device  unauthorized changes to the device design  irregular cleaning and maintenance or failure to clean and maintain due to disturbances or interruptions caused by the external environment

Vers: A2 page 26 / 26 12 Declaraton of conformity